#include <cstdio>
#include <cstring>
#include <iostream>
#include <algorithm>
using namespace std;
int a[110];
int b[110];
int main()
{
	int n,sum,cnt;
	sum = 0;
	cnt = 1;
	scanf("%d",&n);
	for(int i = 1;i<=n;i++)
	{
		scanf("%d",&a[i]);
		sum = sum + a[i];
	}
	if(a[1]>sum/2)
	{
		printf("1\n1\n");
	}
	else
	{
		for(int i = 2;i<=n;i++)
		{
			if(a[1]>=2*a[i])
			{
				a[1] = a[1]+a[i];
				b[cnt] = i;
				cnt++;
				if(a[1]>sum/2)
				{
					printf("%d\n",cnt);
					printf("1");
					for(int j = 1;j<cnt;j++)
					{
						printf(" %d",b[j]);
					}
					printf("\n");
					return 0;
				}
			}
		}
		printf("0");
	}
} 
